* Davide Libenzi <[email protected]> wrote:
> [...] Status word and control bits should not be changed from
> underneath userspace AFAIK. [...]
Note that the control bits do not just magically change during normal
FPU use. It's a bit like sys_setsid()/iopl/etc., it makes little sense
to change those per-thread anyway. This is a non-issue anyway - what is
important is that the big bulk of 512 (or more) bytes of FPU state /are/
callee-saved (both on 32-bit and on 64-bit), hence there's no need to
unlazy anything or to do expensive FPU state saves or other FPU juggling
around threadlet (or even syslet) use.
Ingo
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